Abstract
Two thermally cross-linkable hole transport polymers that contain phenoxazine and triphenylamine moieties, X-P1 and X-P2, are developed for use in solution-processed multi-stack organic light-emitting diodes (OLEDs). Both X-P1 and X-P2 exhibit satisfactory cross-linking and optoelectronic properties. The highest occupied molecular orbital (HOMO) levels of X-P1 and X-P2 are -5.24 and -5.16 eV, respectively. Solution-processed super yellow polymer devices (ITO/X-P1 or X-P2/PDY-132/LiF/Al) with X-P1 or X-P2 hole transport layers of various thicknesses are fabricated with the aim of optimizing the device characteristics. The fabricated multi-stack yellow devices containing the newly synthesized hole transport polymers exhibit satisfactory currents and power efficiencies. The optimized X-P2 device exhibits a device efficiency that is dramatically improved by more than 66% over that of a reference device without an HTL. The synthesis and characterization of two new cross-linkable HTL polymers, X-P1 and X-P2, are described. The current efficiency of a solution-processed multi-stack OLED device with X-P2 is found to be approximately 1.5 times higher than that of the reference device.
| Original language | English |
|---|---|
| Pages (from-to) | 807-812 |
| Number of pages | 6 |
| Journal | Macromolecular Rapid Communications |
| Volume | 35 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - Apr 2014 |
Keywords
- conjugated polymers
- curing of polymers
- heteroatom-containing polymers
- light-emitting diodes
- spin coating